高熵氧化物(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O)應用於鋰離子電池負極材料之研究

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姓名

盧聖元(Sheng-Yuan Lu) 查詢紙本館藏

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材料科學與工程研究所

論文名稱

高熵氧化物(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O)應用於鋰離子電池負極材料之研究
(Study on high entropy oxides (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O) as anode electrode for lithium-ion battery)

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至系統瀏覽論文 (2024-10-31以後開放)

摘要(中)

本實驗將使用溶膠凝膠法(Sol-gel Process)進行高熵氧化物　(Co0.2Cu0.2Mg0.2Ni0.2Zn0. 2O)粉體之製備，並進一步作為鋰離子電池之負極材料進行研究。此製程技術常使用於合成陶瓷粉末，該技術具有粒徑均勻等優點，能有利於電極材料之應用。本研究將利用溶膠凝膠法製備之高熵氧化物(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O)進行鋰離子電池負極材料之應用，並探討高熵氧化物的電化學性能表現與各金屬陽離子與材料之關聯性，透過簡單地改變元素組成來進行電化學性質之測試。
在鋰離子電池實作成果方面，本研究開發之高熵氧化物負極材料，經鋰離子半電池之測試，在50mAh g-1之電流下，其電容值將可達到600 mAh g-1。此外，透過改變高熵氧化物之組成陽離子可進一步證實熵穩定作用對於電池容量而言能帶來顯著之好處，並大幅提高了循環穩定性。另外也進一步結合LNMO之高電壓正極進行全電池之測試，證明高熵氧化物未來將具備替代現今鋰離子電池電極材料之潛力。

摘要(英)

In this study, sol-gel method will be used to prepare high entropy oxide (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O) powder, and will be further studied as an anode material for lithium-ion batteries. Sol-gel method is often used to synthesize powders. This fabrication process not only has the advantages of uniform particle size, but also suitable for the application of electrode materials. This study uses the high entropy oxide (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2O) powder prepared by the sol-gel method for the application of lithium ion battery anode materials, and discuss the electrochemical performance of high entropy oxides and the correlation between metal cations and materials, and test the electrochemical properties by simply changing the composition of the elements.
In terms of the results of the performance of lithium-ion batteries, the high entropy oxide anode material developed in this research has been tested by a lithium-ion half-cell, and its capacity reaches 600 mAh g-1 at a current of 50 mAh g-1. In addition, by changing the cation composition of the high entropy oxide, it can be further confirmed that entropy stability brings significant benefits to battery capacity and greatly improves cycle stability. In addition, high-voltage cathode (LMNO) was further used to test the battery system, which proved that the high entropy oxide will have the potential to replace current lithium-ion battery electrode materials in the future.

關鍵字(中)

★ 高熵氧化物
★ 溶膠凝膠法
★ 鋰離子電池
★ 負極材料

關鍵字(英)

★ high entropy oxide
★ sol-gel method
★ lithium-ion batteries
★ anode material

論文目次

中文摘要 I
英文摘要 II
目錄 IV
圖目錄 VI
表目錄 VII
第一章緒論 1
1-1 前言 1
1-2 研究背景 1
第二章基礎理論及文獻回顧 3
2-1 二次電池 3
2-2 鋰離子電池 5
2-3 高熵之概念簡介 8
2-4 高熵氧化物之特性與應用 11
2-5 陶瓷粉末之製備方法 15
2-5-1 固態反應法 15
2-5-2 氣態反應法 15
2-5-3 液態反應法 16
2-5-3-1 沉澱法 (Precipitation method) 16
2-5-3-2噴霧裂解法 (Spray pyrolysis method) 17
2-5-3-3 溶膠凝膠法 (Sol-gel method) 19
第三章實驗步驟 22
3-1 化學藥品 22
3-2 鋰離子電池負極材料之製備 23
3-2-1 高熵氧化物粉末之製備 23
3-2-3 鋰離子電池之製備 24
3-3 分析儀器 25
3-3-1 掃描式電子顯微鏡 (FE-SEM) 25
3-3-2 穿透式電子顯微鏡 (HR-TEM) 26
3-3-3 X-ray繞射分析儀 (XRD) 27
3-3-4 X-ray光電子光譜儀 ( XPS ) 28
3-3-5 電池測試系統介紹 30
第四章結果與討論 31
4-1 高熵氧化物之材料分析與討論 31
4-1-1 高熵氧化物粉末之顯微結構影像分析 (SEM) 31
4-1-2 X-ray繞射分析 (XRD) 33
4-1-3 高熵氧化物粉末之穿透式電子顯微鏡分析 (TEM) 34
4-1-4 X-ray光電子光譜分析 (XPS) 36
4-1-5 X光近緣吸收光譜 (XANES) 38
4-1-6 高解析感應耦合電漿質譜分析儀分析 (ICP-MS) 41
4-2 鋰離子電池性能測試分析與討論 42
4-2-1 循環伏安圖分析 (CV) 42
4-2-2 充放電測試 43
4-2-3 長時間穩定性測試 46
4-2-4 各元素對於鋰電池性能影響之分析 49
4-3 全電池性能分析及討論 53
第五章結論與未來工作 55
5-1 結論 55
5-2 未來工作 56
參考文獻 57

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指導教授

洪緯璿(Wei-Hsuan Hung)

審核日期

2021-10-26

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